Vol. s4-46, Issue 273, 1918September 01, 1918 EDT
Geologic Section of Blair and Huntingdon Counties, Central Pennsylvania
Geologic Section of Blair and Huntingdon Counties, Central Pennsylvania
Charles Butts,
Butts, C. (1918). Geologic Section of Blair and Huntingdon Counties, Central Pennsylvania. American Journal of Science, s4-46(273), 523–537. https://doi.org/10.2475/ajs.s4-46.273.523